HORTICULTURE

Detailed explanation-1: -Growth in plants occurs as the stems and roots lengthen. Some plants, especially those that are woody, also increase in thickness during their life span. The increase in length of the shoot and the root is referred to as primary growth. It is the result of cell division in the shoot apical meristem.

Detailed explanation-2: -The definition of primary growth is the rapid dividing of cells, primarily in the apical meristems of plants, located at the tips of roots and stems. Primary growth in plants results in the elongation of these organs, both upward in stems, and outward in roots.

Detailed explanation-3: -These three types of meristem are considered primary meristem because they allow growth in length or height, which is known as primary growth. Secondary meristems allow growth in diameter (secondary growth) in woody plants.

Detailed explanation-4: -In many plants, most primary growth occurs primarily at the apical (top) bud, rather than axillary buds (buds at locations of side branching). The influence of the apical bud on overall plant growth is known as apical dominance, which prevents the growth of axillary buds that form along the sides of branches and stems.

Detailed explanation-5: -Arising from lateral meristems, secondary growth increases the width of the plant root or stem, rather than its length. As long as the lateral meristems continue to produce new cells, the stem or root will continue to grow in diameter.